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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2a0145892e6875c290e30dc76e9c4bfa853015383309c65493237194628a1e3c' 
  AND token = 'tg+VEvFB+VxoRtQrAzcaS8M0MWZoLVLVjuvWDsSUBQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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