Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c62a6ac778fc2200c4ee27924baa30b0ff7392e6702f4f3afd14a0e4f15ef82' 
  AND token = 'rILZ2fZiBJ2AYcVFPxz7lRvSbBAwQ5HeTz/HoNtowmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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