Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa6fb34057541c4bfb510feb60b57a4f621cc592c520b10d84e869d27005555' 
  AND token = 'wIIqOz65cfVq1cYKP/3M5OwlqSb3aadw8HST+q6Syj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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