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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b993201e88e0523ecea60c9a0b77a7752d6b759c6c3d96d58a7e738c602f6dad' 
  AND token = 'RcxIcOL4voTEDhXtq5ym1H4xlc/lBLx1GSwrOlwdOqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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