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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '03111e94ca724f931323bdf359e3c340e2d310b2255a24b41292cc58a322e1f2' 
  AND token = 'N/8dW4KNeLu/nqNBWc1YdnNE14ek6uTbYT6iSbh5Cdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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