SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2498dc37152a9b3a6f84ae29dd886262e37f86b1f820102d0a55d9a3fc5d8ef5' 
  AND token = 'Zp70tXyI5sQp6zDCQwQB4175Z3xlLbIBynASmvgazUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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