Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '223a3f2fa021aee44a4ce0c7fb376039d56ecf63163d47a6d1c296e138c8e03a' 
  AND token = 'MSBxsdqxqd5ifMDcLhoIZdn7G4T0paJvoh3/TdlSEhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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