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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9ae0e9c65b8425a207a13d3badcf81f8806200ce1b0f81e174cfd9b7a1c828be' 
  AND token = 'SG7/OmnpnLxQCgKtO30u+TMW/fYiYS4h3gbzIETxsE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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