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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c7fe2bee06dcc78d022429ff32202b1424dedd0834c79dce9a90884e3f4208cf' 
  AND token = 'Lib5Yn6w+CBUh14o3rxb2RFaCVjp72xKrwLxbPBP7xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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