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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '051b8c353307a476e061552d9cc2c03ca700a3f7dd7965a9e8632435a12244e8' 
  AND token = 'sTi7bnpdECs5iLqTXTkEyfJRciLQ81nArTEB6ZPem4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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