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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '83d511c4f3a1599d36177f6d783efdbe3dd831a82dedc460bb3ea5dcae790549' 
  AND token = 'XHsPbQ6Fs/QMxx673LyF/+sIPgxDLUAovg5oYLD6zJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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