Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e2ca0285668aef7d986bed8796633cc19a9829c3f2f76f6c65e9b89b3ce4d2' 
  AND token = 'gtGSXqyVkFPQoQw0Psq7eHKoW21MAcTsFqlu16DCgyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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