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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd959b3c9d2d2a954a15c31729dc18f3d29663c3252662506514060246d4b8706' 
  AND token = '8iJJujD2TpH+HkhOL9hyaKTxdcax6/a8+mvXxx1pxu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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