Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55d0660fe0528279321251e0f4f3fd4cb05cfce1c53fddbe8fcec5578ed021c' 
  AND token = 'MAGyxNhMrjv22IcfTOHKKx4ooYm/9Iy8BK38aEQ/eVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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