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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3665ee135da5471363f27cd694a18abfab23100e18f2cb0e7695c064dc53de73' 
  AND token = 'w62ZqS8qS2FPZQ2HjANYfxnpHk3suzGxzl7z8rtc7MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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