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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1431781d61e822b1d3d6c9aabd516b6226369c7ab87bd784b485a64cf2e4531a' 
  AND token = 'EiTbWrTRP2/4lyxrsPNZ5A81Bkxl5NuuVTLCjOTO8qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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