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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '79bc42ec23c2a5ba06b5cc7da977acf7157126d779bb76ff79d3d8d84c43f24f' 
  AND token = 'rhlD7aYYFOfXzvcXdRi+AOBWaQ9gYBWmwpavNe7JPi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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