Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff43b7d8b2244d7172b34809cad1b2378d137467f9b416d385dc2cda09d5502' 
  AND token = 'EFFUaLyFBrK8PKaDapAMg9I5sIqY/2UR1F5z19GgYZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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