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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '209fb5602b3a6be2b995e3a0ee88274871b01fccb1b6a2833cb1c38cdd8a3fb0' 
  AND token = 'Lox22AF5kW3k9KLZmBdGQ8DglPaxfAs+g8U/YEFRQr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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