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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a73f83e21941a8648d1adce8ab8e7833c9c28c1196147517d1e070a32bcc8196' 
  AND token = 'Ru8rFl6TqENn02uX+i9MfIrUfagfQxC+Za9SrPphkdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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