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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4bc7e27ff06c685289c88174be43a95fbf759048deee8d800af8f5f641ec1817' 
  AND token = 'q6oZbnpvxp6xz2qQ7m4riSNNYT6BNvhuYOBftnyw/cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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