Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5375bc631876fdb38bea5807daca40864ccb56b9ed7898bd7818b4d0a84405' 
  AND token = 'PTKBCL7pyDOIXXiDzp6zsinrydpIP7Lwv/r2pf624RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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