SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7e9dc476ba8c43804b570f6fdcd1ac9c205c5d7ff3b1f0eba03325631ff768b6' 
  AND token = '73MFIptpBNKUVTB0JT8OsRRBJywbdDXpw7vS2W2hZcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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