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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ff5161c91327e80074822781b7abbc1ad6ec4a85c100b4a6661d6c5f729e5316' 
  AND token = '79fKyYK9cco8oRUh4NcFgwi/zHra1+tROsUxR7bQdiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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