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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f3d4f4603d2d757d3b2bf8ff635752d1ca5101a6da35e07d52cc506949970ddf' 
  AND token = 'i9JkWoSB6+nq28NQNooIJiqDj2IE5GnTcn3kdDzyLZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}