Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f7cff91953b16fb2c441df2351d0be337f729280796418f605b8081f3aad79f2' 
  AND token = 'ZdhPpqFqOUew6ql3wpER+dOKAAx9pTk22e+weAIXtAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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