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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '556e3b7b8f4b05e4e1164143c92f82591bfdb73ad6e40be64a3ea49cd3bc539e' 
  AND token = 'AcA95VkWUkt9+cindKAP2NoJoZhnBbaX+4TiYCAD42Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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