Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa76b09ffb1e5d78b8af02bcf239e74ee2452a1cfabb52ee144fa0372bb5023a' 
  AND token = 'ExNUje8eTKSpf2XsKdLs+sTYthbpguOb3D9tOAFQDk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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