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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '831a2386e0777f649d4d97af3e5202bc1113be77d00de6a4e2d712c9bc1c2ff1' 
  AND token = '8xQ+r5779867Fcq4GnIIrL8/oNMBCDJXPMnKV6I5yH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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