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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'eddd2c650e39467aa8bf2ab7fde35ca819b8404b81a98dbc0bd8e37ff6705efc' 
  AND token = '+H5iTVPQpAel+F4kN4HmGU7QutdpAuMa8s54h4zz/Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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