Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '060c8743881fe5a5df2dc96a874453eaff6c37421ac6399f92e3aee1c37a8194' 
  AND token = 'VllMe4b59HIPF+Ee35olhLE9PtxB6bkxyKg+Cslkx8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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