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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4c4b1db8b2343c6d77c8d251f4d298cd502d3950450c092278999ff7a9b93b80' 
  AND token = 'BxBy3TH5NpSqTVI56oAp/ZwA2EdDFHaWXe3cCXlgfAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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