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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8e678c076e9df10a279030ab1a1e4781d46d6629ede308bfb9d0751350dcc12d' 
  AND token = 'Nx4tEDFOzXCBU/IjZ3yXZ5pnl3IH3TLSbdUK17pVaA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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