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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bdb3d00c7fb89cf5b0d034d0eb10f5aea53db06a6d75863e6adc63389dbd9ceb' 
  AND token = 'QiVBTilX6Uj0PQC8K4UKfQqIs4E1HiJWcl3eVkkyJe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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