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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'efad90ede59eec4e4727b63ceae950b566d60a4aead3c67703463d39b8cdd6e9' 
  AND token = 'nU6Lm+Fkl403xYoUX6H193vpABlcWWkZrA5sT2R2+KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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