Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ddfd2a13644a205cbabbe7a518e5629df73a1ad4d1e936c624ed5e80537fbb' 
  AND token = 'ZsG9AfhCutg804QxYzr/AeAnkgHfZGEIDM0A3aHHL4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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