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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e96553881ef3d7107e3ec25028cb4a919792518cd3fac7cfa3aea1c710210e56' 
  AND token = '07jq7zjlTOwjiOcXC1WjJX+T4/UgezkzzZEWXW4l/h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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