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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9e0cad1d632ca3200c389bd87e778e315ca46c0747eb053b767e11f5cd5fbff0' 
  AND token = 'HZoIAun1v2dL5jHdwujO15ZepaGd9I+mkwg3SO5XO8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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