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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0992e70ce0d32cbb500113d40c4379b552ece1359ea6e83ec670ae711b9b8249' 
  AND token = 'SvuRDn04HdKi6iVLrQTMQB2y9j5hbfW/wOdoGJHbWWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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