SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7dc1cd9f0e5c9a74cec34c3a476843c330ab080c90b0e235978a6d2b7a0f5673' 
  AND token = '4z1b7/R4azYzXZx+GDWiiHMK8lKv2JB6NU8rwLzYtXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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