SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '87d6c2090be69d6ab32b3c7fad6e8dc8605ba5df98aca78ef5f1089ea017488f' 
  AND token = 'KFJWZnLPc5J4zltx/p+WSi+iqaKmX+UArJQefL6yr1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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