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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5963b5d5ac74cf5510db4afbbc67647f1b7010dfc3ce9fd35d3afdd04d16f00e' 
  AND token = '3h5Ic0i2t1aRviQ9r+hcmJcfUBH+iutyMTXBbFPmw0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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