SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9d02bf35306b05af8a1b31a0bfa75fc2f7dc089f097504bc8cf7dbdc7412afcc' 
  AND token = 'Ro1Jg/ktcdLjr4Myy5bmGtMOPJIV7K9+31qwBpEFJJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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