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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '67ca30dbde03d47c06d6c82c531b664ab1dac96a5e1b37ae0b56820f3abf9de2' 
  AND token = 'agNCRUj7Hsk9d7oatL07yhrepCl1hSUHH9++fqtG3dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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