Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0cfaf2a03c7d2416b34f8d039eb89d0e19aa7f383adc1ce33de81ae58e4d511' 
  AND token = 'jZMcfmBIBle+72WnRO/fScB5d5jkjI1Oc0/0+y67yeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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