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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3d27b2f9571b8fdd88b53219580b18b17c364986e5b70daff313363d16724ce7' 
  AND token = 'QsqlyiQ++vi2/GEda6Tq+d1bZsWNyrDQ6hIpkRmUb74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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