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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '081a5c9bafe293368931748515747b7c14f071ee87d33368bb1433d6c00cdead' 
  AND token = '6oTLNdNFmkpr1pUnnN5CyyNYPI4YAoRhoXnrjNvjZg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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