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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9cb8353a1f331b04783bc59f69635962f26aae02d17b6b7e270f6b05c4076de9' 
  AND token = 'MBShREeWnRP1w/hrpw0lun1Ila07sIQVjcM4hQgH9ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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