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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd9581fc249b79d648b8714d3ba87cd8c081bfaed6dd9561d19ef2ceec2c7fa67' 
  AND token = 'IPNP653Mg3F3vxCnBQjZGYh4LL3dwS8y6PXh6RMkFlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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