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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2c11eb40c2b7b5f4b92ecadd6ed960e199625e8bd1ed50fd8536dfeb222f8ef5' 
  AND token = 'GzC7w7OauDWN2G2qYXCeaFhm85IJwe/wPEmM2EKCU+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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