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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '47197741323d9b159be4a749ec1a6a9871d71c6d3ffdeb60ab0967a9fc27da93' 
  AND token = '+7i+v3skipJfH1dMZdOgvc0ZNJ+Hr6WwO/w+LwXyS+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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