Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9ffc367d4df61467765646b1fca90dd88397ebb26455d493fa59ac50117f0fa8' 
  AND token = 'sqPel8HvPAeGTaG4XSDRW50q+prc81AHY01S0S/rD6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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