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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e0227b3bcf6143be95e685fa56ef3c549ffff6b4317f1a0e0a70779080be9b12' 
  AND token = 'j2uZrL/o8HX2Ji3SaI5+kE57NLK32wMGL/aq47P2lQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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