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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dd7c0c33ed13765ad68c0a515d696d9b9ccbf12afe0b91dc45f16e8a3adf440d' 
  AND token = 'IEPI25kD0IlBskXnabGgMz5/ArLgR3vQ7QG1hlTkaJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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