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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b1ce8c0c990717192905ce3b70b70c8a88c3c6fe5ce5b5e42e3cb3c70bdc70da' 
  AND token = 'brJRKDFyEyI6+LtuZhBb65TDavKrzFdyNvhZ+euAg6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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