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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0bd4b5bdc8b67d7dcf7c3ec99f647f6726e392135d3c0f3bba14b87d232e7afd' 
  AND token = 'ZoaEchfYtC8UCxzoRj6D3FMw5yEI4MkwyG9W8P5GJeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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