Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918f79a45594ce3adddf74a4ece90aa33a2a0dde6c47888ad2bae2e419860b65' 
  AND token = '8i8dZIf2If5bRb3Ko/KhMpAslO7dtAuexgdSuweEJr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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