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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8660c4e0ffe6f44717b4ffcf4fc26fe7021b1cbec60fa6cc1699ed42d16ebbe0' 
  AND token = 'Px6YODRUM9GBQYlZE3Uyo6Q7qpUnhrVvs2lXn6Qniys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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