SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1829b33975b064d2c6c2de0bfd50c56e341c741e0f29e87c465fbbacb75eb103' 
  AND token = 'wdfX1wfl6H4KANLFGHxOBEnQ7C8zsrjQhXm13fLRl4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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