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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7c0f7b1f0c30b8bb8e073098233d3dd871325a7f6c62633afab257f113cabc14' 
  AND token = 'RNmhFFE2ZV1HOmO5ANIreUKyJAwZm+35Bws1bnmNwJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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