Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd15d88a9fb074822ed9a778d856524d73a88786bf1d6012b1ab8a0069d22394c' 
  AND token = '8D4oZkojlDOmklPhDt/y0zM8JLl0uqrWOuwMLcGrQR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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