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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '440d0517a73f5471faff33d789fecef1dcce28396e327407b255043597cb16d1' 
  AND token = 'oXNoyeR2OnfhwSYCsKAzoIor7auKDL/lA4eH0UAhGn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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