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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '61d4a446d9b7d5b495ef6ecc6cca48442328ba3b9dbdcb7429d428dcacd5c472' 
  AND token = 'O0g64z3rl/FB2q3BqNboxVOK3yOX9DuOIJQXkmM3Zwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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