Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e75b5137dcc9ccbf91b39301952de4358512e92706e53ae30a2e31ef90431ff' 
  AND token = '55TLbjlqkL3QrBfKFa5FZG+ycA+rBScj6EogogFXNS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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