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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ce70ce24c75df7b559f01a2b53befaa41c1664f8fa4f5b97d1b06ee3a796dc49' 
  AND token = 'J6oDMEYnwuN1iknsOtIGDCfSDF7uKUW/H4EJ293sbOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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