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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7e7ad33314b59210866b94cc291abe34f0e426d37cfe119fb8208d0cece197f4' 
  AND token = 'FhrEqCqRHwsGJN0H6J4SLHj4e8pX6PIuLQL5cQohfMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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