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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '172ac254c41d68c4a862ca11d221079cc6e48450cba296c1be42d49bedd1c3fd' 
  AND token = 'i92J1U8LWHtT0k24bOsIe4tqfWeCIoe/wP5SBnurgUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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