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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c2b8fbe229838e77f4f85ae24ddc1f81b0a8283319bd545889f61f1c92c0e339' 
  AND token = '29iT6g/29gdaZDGLwkjruAsiWqBMPHpDBfKakPy98S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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