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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2da7cabc16b67e84a59e8b65868d30a3071554452935dda05e4473ccc9cd02fe' 
  AND token = 'cEDCzErTmTiqzIC3g4ia3nnYf33XsU5fiIYsSkFkD7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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