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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd32f299a6ede63fdce6295973b6a0638577e94893ba61da9a3754e5101192a54' 
  AND token = 'yBGUoS4uJL/WSCA6A/5FqtLpwP/YUcIPP8H2yuXIoPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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